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|
#!/bin/bash
mount_count=128
function print_usage()
{
if [ -n "$2" ]; then
echo "Error: $2"
echo
fi
echo "Usage: $1 <scratch dir> [seed]"
echo "(If no seed is given, it will be randomly generated.)"
}
scratch_dir=$1
if [ -z "$scratch_dir" ]; then
print_usage "$0" 'No scratch dir given' >&2
exit 1
fi
if [ ! -d "$scratch_dir" ]; then
print_usage "$0" "$scratch_dir is not a directory" >&2
exit 1
fi
seed=$2
if [ -z "$seed" ]; then
seed=$RANDOM
fi
RANDOM=$seed
echo "Seed: $seed"
set -e
shopt -s nullglob
cd "$scratch_dir"
if [ -d share ]; then
echo 'Error: This directory seems to be in use already' >&2
exit 1
fi
for ((i = 0; i < $mount_count; i++)); do
printf "Setting up fs %i/%i...\r" "$((i + 1))" "$mount_count"
rm -f fs$i.img
truncate -s 512M fs$i.img
mkfs.xfs -q fs$i.img
devs[i]=$(sudo losetup -f --show fs$i.img)
done
echo
top_level_mounts=$((RANDOM % mount_count + 1))
mkdir -p share
echo 'root' > share/some-file
for ((i = 0; i < $top_level_mounts; i++)); do
printf "Mounting fs %i/%i...\r" "$((i + 1))" "$mount_count"
mkdir -p share/mnt$i
touch share/mnt$i/not-mounted
sudo mount "${devs[i]}" share/mnt$i
sudo chown "$(id -u):$(id -g)" share/mnt$i
pushd share/mnt$i >/dev/null
path=mnt$i
nesting=$((RANDOM % 4))
for ((j = 0; j < $nesting; j++)); do
cat > some-file <<EOF
$i
$path
EOF
mkdir sub
cd sub
path="$path/sub"
done
cat > some-file <<EOF
$i
$path
EOF
popd >/dev/null
done
for ((; i < $mount_count; i++)); do
printf "Mounting fs %i/%i...\r" "$((i + 1))" "$mount_count"
mp_i=$((i % top_level_mounts))
pushd share/mnt$mp_i >/dev/null
path=mnt$mp_i
while true; do
sub_mp="$(echo mnt*)"
if cd sub 2>/dev/null; then
path="$path/sub"
elif [ -n "$sub_mp" ] && cd "$sub_mp" 2>/dev/null; then
path="$path/$sub_mp"
else
break
fi
done
mkdir mnt$i
touch mnt$i/not-mounted
sudo mount "${devs[i]}" mnt$i
sudo chown "$(id -u):$(id -g)" mnt$i
cd mnt$i
path="$path/mnt$i"
nesting=$((RANDOM % 4))
for ((j = 0; j < $nesting; j++)); do
cat > some-file <<EOF
$i
$path
EOF
mkdir sub
cd sub
path="$path/sub"
done
cat > some-file <<EOF
$i
$path
EOF
popd >/dev/null
done
echo
echo 'Done.'
|
